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x in (-oo:+oo)
y-((6/8)*x^2) = 0
(-3/4)*x^2+y = 0
-3/4*x^2 = -y // : -3/4
x^2 = 4/3*y
x^2 = 4/3*y // ^ 1/2
abs(x) = (4/3)^(1/2)*y^(1/2)
x = (4/3)^(1/2)*y^(1/2) or x = -((4/3)^(1/2)*y^(1/2))
x in { (4/3)^(1/2)*y^(1/2), -((4/3)^(1/2)*y^(1/2)) }
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